http://blog.donews.com/tianshun/archive/2013/07/
http://wenku.baidu.com/view/e5a736e3e53a580217fcfe18.html?re=view&from_page=view&from_mod=download
http://www.zhihu.com/people/tian-shun/topic/19575436/answers
http://www.yeeach.com/
http://www.zhihu.com/people/chuanliang/answers
http://www.zhihu.com/people/linmahua/answers
